package model

import (
	"encoding/json"

	"github.com/pgvector/pgvector-go"
)

// --- Captain Enums (M10 P10) ---

type AssistantStatus string

const (
	AssistantStatusActive   AssistantStatus = "active"
	AssistantStatusDraft    AssistantStatus = "draft"
	AssistantStatusArchived AssistantStatus = "archived"
)

type DocumentStatus string

const (
	DocumentStatusPending    DocumentStatus = "pending"
	DocumentStatusInProgress DocumentStatus = "in_progress"
	DocumentStatusCompleted  DocumentStatus = "completed"
	DocumentStatusFailed     DocumentStatus = "failed"
)

type DocumentSyncStatus string

const (
	DocumentSyncStatusPending DocumentSyncStatus = "pending"
	DocumentSyncStatusSynced  DocumentSyncStatus = "synced"
	DocumentSyncStatusStale   DocumentSyncStatus = "stale"
	DocumentSyncStatusFailed  DocumentSyncStatus = "failed"
)

type ResponseStatus string

const (
	ResponseStatusApproved ResponseStatus = "approved"
	ResponseStatusPending  ResponseStatus = "pending"
	ResponseStatusRejected ResponseStatus = "rejected"
)

type CopilotMessageType string

const (
	CopilotMessageTypeUser              CopilotMessageType = "user"
	CopilotMessageTypeAssistant         CopilotMessageType = "assistant"
	CopilotMessageTypeAssistantThinking CopilotMessageType = "assistant_thinking"
)

type ToolAuthType string

const (
	ToolAuthTypeNone   ToolAuthType = "none"
	ToolAuthTypeBasic  ToolAuthType = "basic"
	ToolAuthTypeBearer ToolAuthType = "bearer"
	ToolAuthTypeApiKey ToolAuthType = "api_key"
)

// --- Captain Assistant Model ---
// Reference: Chatwoot enterprise/app/models/captain/assistant.rb
// Table: captain_assistants
//
// Captain Assistant is the core orchestrator entity for AI features.
// It holds configuration (temperature, feature flags, product name),
// guardrails, and response_guidelines as JSONB.
// Associated with Account, has Documents, Responses, Scenarios, Inboxes (via CaptainInbox).

type CaptainAssistant struct {
	Base
	AccountID          uint            `gorm:"index;not null" json:"account_id"`
	Name               string          `gorm:"size:255;not null" json:"name"`
	Description        string          `gorm:"size:1024" json:"description"`
	Config             json.RawMessage `gorm:"type:jsonb;not null;default:'{}';serializer:json" json:"config"`
	Guardrails         json.RawMessage `gorm:"type:jsonb;serializer:json" json:"guardrails,omitempty"`
	ResponseGuidelines json.RawMessage `gorm:"type:jsonb;serializer:json" json:"response_guidelines,omitempty"`
	Status             AssistantStatus `gorm:"size:50;default:active" json:"status"`

	// Relationships (loaded via service layer or GORM preload)
	Documents      []CaptainDocument          `gorm:"foreignKey:AssistantID" json:"documents,omitempty"`
	Responses      []CaptainAssistantResponse `gorm:"foreignKey:AssistantID" json:"responses,omitempty"`
	Scenarios      []CaptainScenario          `gorm:"foreignKey:AssistantID" json:"scenarios,omitempty"`
	CaptainInboxes []CaptainInbox             `gorm:"foreignKey:AssistantID" json:"captain_inboxes,omitempty"`
	CopilotThreads []CopilotThread            `gorm:"foreignKey:AssistantID" json:"copilot_threads,omitempty"`
}

func (CaptainAssistant) TableName() string { return "captain_assistants" }

// DefaultAssistantConfig returns the default configuration for a new Captain Assistant.
// Reference: Chatwoot Captain::Assistant default config values
func DefaultAssistantConfig() map[string]interface{} {
	return map[string]interface{}{
		"temperature":         0.7,
		"product_name":        "",
		"feature_flags":       map[string]bool{},
		"response_guidelines": "",
	}
}

// AssistantConfig provides typed access to JSONB config fields.
// Reference: Chatwoot store_accessor :config, :temperature, :feature_faq, etc.
type AssistantConfig struct {
	Temperature              float64 `json:"temperature,omitempty"`
	FeatureFAQ               bool    `json:"feature_faq,omitempty"`
	FeatureMemory            bool    `json:"feature_memory,omitempty"`
	FeatureContactAttributes bool    `json:"feature_contact_attributes,omitempty"`
	ProductName              string  `json:"product_name,omitempty"`
	Instructions             string  `json:"instructions,omitempty"`
	Model                    string  `json:"model,omitempty"`
}

func (a *CaptainAssistant) GetConfig() (*AssistantConfig, error) {
	var cfg AssistantConfig
	if len(a.Config) == 0 || string(a.Config) == "{}" || string(a.Config) == "null" {
		return &cfg, nil
	}
	if err := json.Unmarshal(a.Config, &cfg); err != nil {
		return nil, err
	}
	return &cfg, nil
}

func (a *CaptainAssistant) SetConfig(cfg *AssistantConfig) error {
	data, err := json.Marshal(cfg)
	if err != nil {
		return err
	}
	a.Config = data
	return nil
}

// GetResponseGuidelines unmarshals the ResponseGuidelines JSON field.
// Returns nil and no error if the field is empty/null.
func (a *CaptainAssistant) GetResponseGuidelines() (string, error) {
	if len(a.ResponseGuidelines) == 0 || string(a.ResponseGuidelines) == "{}" || string(a.ResponseGuidelines) == "null" {
		return "", nil
	}
	// ResponseGuidelines may be a plain string or a JSON object
	// Try unmarshaling as string first
	var s string
	if err := json.Unmarshal(a.ResponseGuidelines, &s); err == nil {
		return s, nil
	}
	// Otherwise return the raw JSON as a string
	return string(a.ResponseGuidelines), nil
}

// GetGuardrails unmarshals the Guardrails JSON field.
// Returns an empty string and no error if the field is empty/null.
func (a *CaptainAssistant) GetGuardrails() (string, error) {
	if len(a.Guardrails) == 0 || string(a.Guardrails) == "{}" || string(a.Guardrails) == "null" {
		return "", nil
	}
	var s string
	if err := json.Unmarshal(a.Guardrails, &s); err == nil {
		return s, nil
	}
	return string(a.Guardrails), nil
}

// --- Captain Document Model ---
// Reference: Chatwoot enterprise/app/models/captain/document.rb
// Table: captain_documents
//
// Captain Document represents a knowledge base entry (web page or PDF)
// linked to an Assistant. Contains content, sync tracking, metadata,
// and content_fingerprint for deduplication.

type CaptainDocument struct {
	Base
	AccountID           uint               `gorm:"index;not null" json:"account_id"`
	AssistantID         uint               `gorm:"index;not null" json:"assistant_id"`
	Name                string             `gorm:"size:255" json:"name"`
	ExternalLink        string             `gorm:"size:2048;not null" json:"external_link"`
	Content             string             `gorm:"type:text" json:"content,omitempty"`
	ContentFingerprint  string             `gorm:"size:64" json:"content_fingerprint,omitempty"`
	Status              DocumentStatus     `gorm:"size:50;default:in_progress;not null" json:"status"`
	SyncStatus          DocumentSyncStatus `gorm:"size:50" json:"sync_status,omitempty"`
	LastSyncedAt        *int64             `json:"last_synced_at,omitempty"`
	LastSyncAttemptedAt *int64             `json:"last_sync_attempted_at,omitempty"`
	LastSyncErrorCode   string             `gorm:"size:50" json:"last_sync_error_code,omitempty"`
	Metadata            json.RawMessage    `gorm:"type:jsonb;serializer:json" json:"metadata,omitempty"`

	// Relationships
	Assistant CaptainAssistant           `gorm:"foreignKey:AssistantID" json:"assistant,omitempty"`
	Responses []CaptainAssistantResponse `gorm:"foreignKey:DocumentableID" json:"responses,omitempty"`
}

func (CaptainDocument) TableName() string { return "captain_documents" }

// --- Captain AssistantResponse Model ---
// Reference: Chatwoot enterprise/app/models/captain/assistant_response.rb
// Table: captain_assistant_responses
//
// FAQ-style knowledge entry with question/answer pair.
// Has pgvector embedding (1536 dims) for similarity search.
// Polymorphic documentable association (can belong to Assistant or Document).
// Status workflow: approved/pending/rejected.

type CaptainAssistantResponse struct {
	Base
	AccountID        uint           `gorm:"index;not null" json:"account_id"`
	AssistantID      uint           `gorm:"index;not null" json:"assistant_id"`
	DocumentableID   *uint          `gorm:"index" json:"documentable_id,omitempty"`
	DocumentableType string         `gorm:"size:50" json:"documentable_type,omitempty"` // "CaptainAssistant" or "CaptainDocument"
	Question         string         `gorm:"size:1024;not null" json:"question"`
	Answer           string         `gorm:"type:text;not null" json:"answer"`
	Status           ResponseStatus `gorm:"size:50;default:approved;not null" json:"status"`
	Edited           bool           `gorm:"default:false;not null" json:"edited"`
	// pgvector-go Vector type for 1536-dimensional embeddings
	Embedding pgvector.Vector `gorm:"type:vector(1536)" json:"embedding,omitempty"`

	Assistant CaptainAssistant `gorm:"foreignKey:AssistantID" json:"assistant,omitempty"`
}

func (CaptainAssistantResponse) TableName() string { return "captain_assistant_responses" }

// --- Captain Scenario Model ---
// Reference: Chatwoot enterprise/app/models/captain/scenario.rb
// Table: captain_scenarios
//
// Scenario is a specialized agent configuration within an Assistant.
// It can be enabled/disabled, has its own instruction text,
// and declares which tools it uses (as JSONB array).
// Scenario acts as a "handoff" target in the multi-agent system.

type CaptainScenario struct {
	Base
	AccountID   uint            `gorm:"index;not null" json:"account_id"`
	AssistantID uint            `gorm:"index;not null" json:"assistant_id"`
	Title       string          `gorm:"size:255" json:"title"`
	Description string          `gorm:"type:text" json:"description,omitempty"`
	Instruction string          `gorm:"type:text" json:"instruction,omitempty"`
	Enabled     bool            `gorm:"default:true;not null;index" json:"enabled"`
	Tools       json.RawMessage `gorm:"type:jsonb;serializer:json" json:"tools,omitempty"` // array of tool names

	Assistant CaptainAssistant `gorm:"foreignKey:AssistantID" json:"assistant,omitempty"`
}

func (CaptainScenario) TableName() string { return "captain_scenarios" }

// --- Captain CustomTool Model ---
// Reference: Chatwoot enterprise/app/models/captain/custom_tool.rb
// Table: captain_custom_tools
//
// User-defined HTTP tool with configurable endpoint, method,
// auth, request/response templates (Go template equivalent of Liquid),
// and parameter schema. Max 15 per account. Slug is unique per account.

type CaptainCustomTool struct {
	Base
	AccountID        uint            `gorm:"index;not null" json:"account_id"`
	Title            string          `gorm:"size:255;not null" json:"title"`
	Slug             string          `gorm:"size:64;not null;uniqueIndex:idx_account_slug" json:"slug"`
	Description      string          `gorm:"type:text" json:"description,omitempty"`
	EndpointURL      string          `gorm:"type:text;not null" json:"endpoint_url"`
	HTTPMethod       string          `gorm:"size:10;default:GET;not null" json:"http_method"`
	AuthType         ToolAuthType    `gorm:"size:20;default:none" json:"auth_type"`
	AuthConfig       json.RawMessage `gorm:"type:jsonb;serializer:json" json:"auth_config,omitempty"`
	ParamSchema      json.RawMessage `gorm:"type:jsonb;serializer:json" json:"param_schema,omitempty"`
	RequestTemplate  string          `gorm:"type:text" json:"request_template,omitempty"`
	ResponseTemplate string          `gorm:"type:text" json:"response_template,omitempty"`
	Enabled          bool            `gorm:"default:true;not null" json:"enabled"`
}

func (CaptainCustomTool) TableName() string { return "captain_custom_tools" }

// --- Captain Inbox (join table) ---
// Reference: Chatwoot CaptainInbox model
// Table: captain_inboxes
//
// Links a Captain Assistant to an Inbox, enabling the assistant
// to operate on conversations in that inbox.

type CaptainInbox struct {
	Base
	AssistantID uint `gorm:"column:captain_assistant_id;index;not null" json:"captain_assistant_id"`
	InboxID     uint `gorm:"index;not null" json:"inbox_id"`
	AccountID   uint `gorm:"index;not null" json:"account_id"`
}

func (CaptainInbox) TableName() string { return "captain_inboxes" }

// --- Captain Preference ---
// Reference: Chatwoot enterprise/app/models/captain/preference.rb
// Table: captain_preferences
//
// Per-account AI configuration: tone, language, response guidelines,
// and feature toggles. Each account has at most one preference record.

type CaptainPreference struct {
	Base
	AccountID           uint   `gorm:"uniqueIndex;not null" json:"account_id"`
	Tone                string `gorm:"size:50;default:professional" json:"tone"`        // professional, friendly, casual, formal
	Language            string `gorm:"size:10;default:en" json:"language"`              // ISO 639-1 language code
	ResponseGuidelines  string `gorm:"type:text" json:"response_guidelines,omitempty"`  // free-form instructions for AI responses
	AutoLabelEnabled    bool   `gorm:"default:false" json:"auto_label_enabled"`         // auto-apply label suggestions
	AutoFollowUpEnabled bool   `gorm:"default:false" json:"auto_follow_up_enabled"`     // auto-create follow-up tasks
	AutoReplyEnabled    bool   `gorm:"default:false" json:"auto_reply_enabled"`         // auto-send assistant responses
	MaxResponseLength   int    `gorm:"default:500" json:"max_response_length"`          // max characters in AI response
	CustomPromptSuffix  string `gorm:"type:text" json:"custom_prompt_suffix,omitempty"` // appended to system prompts
}

func (CaptainPreference) TableName() string { return "captain_preferences" }